Spektrumanalys och intensitetsundersökning av ljuskällor

Sammanfattning:  The department of Solid State Electronics develops and manufactures solar cells. Then they need a reliable method for evaluating the performance of the solar cell. One of their rigs use a halogen lamp with a power of 300W. The lamp has gone out of production and needs a replacement. The purpose of this project is to find a suitable replacement. A suitable replacement must fulfill certain requirements; the light source has a light spectrum similar to that of the sun, a homogeneous light pattern and intensity of 1000W / m2. The lamp that the department currently uses only have a life span of 15 hours, so finding a lamp with a longer lifetime is desirable. The lamps have been tested using a spectrometer and a photodiode. With these two measurements it could be determined how similar the light source is to the sun. After testing several lamps, the results showed that many of the lamps spectrum were similar to the sun, but their intensity was too low. Therefore lenses were used to focus the light and increase the intensity. Light diffusers have been used to spread and smooth out the light. A Philips halogen lamp with a power 250W, together with lenses and a light diffuser, was found to be the best replacement and fulfilled all the predetermined requirements. A great advantage of this lamp is that it has a lifetime of 1000 hours.